The utility model discloses a protection casing for lengthening photo controls life, including the cover body, cover body bottom opening and inside cavity, the bottom opening outside of the cover body is equipped with convex retainer plate limit along the department, and the retainer plate edge is equipped with the screw, utilize retainer plate limit cooperation screw realize with the PCB board between fixing, the top surface of the cover body adopts ARC structure, and the top of the cover body is equipped with a circular shape opening, and the opening part installs orbed printing opacity cover, the utility model discloses in orbed printing opacity cover whole to enter the plain noodles long -pending big, the ball structure surface is bigger simultaneously, has avoided the dust accumulation to cause the whole adiactinic condition like this, the laminating has copper foil paper on the inner wall of the cover body, utilizes copper foil paper to produce the electromagnetic shield effect, prevents that the circuit component of the cover body from receiving outside electromagnetic interference to make equipment life longer.